09.18: A wire has a conventional cu i+ a04fxg+-u-k2qakc ;fgzkq rrent I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the leftc+gax k0 zf u4a;gk-f +q2qik-. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best describes t9 5vg(t7ha2q,mq so buhe direction of the magnetic field at the point P located directly above the center of the magn, tqg ( ab9h27smuvoq5et?

  11.34: A wire lies in the plane o)o 6u 6on siwqeulx+ *2ce).wif the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the rig *luqce62xu )wo i.o+ise)6 nwht toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton moving t9w1iepvb(f3 toward the top of the page at the instant shown, whew 19tbfvp3 (iat is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a (5wwi p+ l 9x(b fqrl55kbdm/xlong straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is a distance R from the wire and heading directly toward it, the forcewbxb i 5lx +(lpd9q5/f5rm k(w on the proton is:

  95.16: A charged particd 5tsr ;/1df:s;f5x3 y antbpble with constant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The particle b5yt nddts;s/ fx:f5 arb13p; will:

  98.10: A charged part:o+onhk sm;g3oo.5 i ;pkn,yr icle with constant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocity. Theh;; oi sn5 y+o3. prmk:okgo,n particle will

  03.34: A positively charged particle ob g0 ol- k)fj3 mh2lq1lpg:.zof mass M is at rest on a table. A non- zero electric field E is directed into the plane of the table. A non-zero magnetic field B is directed out of the plane of the table. What is true about thk fzpboj13 q2m gl-) llo0.g:he magnitude of the electric force on the particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with conydc +,ep qfa3sx/-w9zy2z wh4 stant non-zero velocity in a region of space that has a uniform magnetic field directed into the pc4/ sexfh-9qpwway2,z +ydz 3lane of the page. The proton moves directly up the plane of the page. What is the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of nek.1hjc xpf+9q7c5r,ltx au/m gligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of tha+/ft 9,1m j7rl q.5xxcckuphe acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an a5q5hv ev l;5g8 )rpb,h,obw cyngle of 300 to the horizontal enters a region with a constant magnetic f;l855 ,pvv5 oqgcr ),hhb ybweield directed horizontally in the plane of the page as shown. At the instant that the electron enters the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves wie50j2e jkchm7a93p fkp /y 5rnth speed $1.00× 10^3\: m/s$ as it enters a region of space that has only a uniform magnetic field. The electron is accelerated because of this field with a constant magnitude of $8.00× 10^5\: m/s^2$ for the entire time of $1.00× 10^{−3}s $ that it is in the field. With what speed would the electron exit the field? Ignore gravity.

  14.29 An electron with charge −e and mass m trq/pxo3+yug fyuogp :* 9k.; ihavels at a speed v in a plane perpendicular to a magnetic field ouyo p i.3qp ogu:+x;9gh/f*ykf magnitude B. The electron follows a circular path of radius R. In a time t, the electron travels halfway around the circle. What is the amount of work done by the magnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, and speed v enters a ma6qrfc 2blryx)mv8 vy4;cl* +p gnetic field B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while m, q, and Bc8) 6y 2y*r b+vml f;4xlcvpqr are unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orb9 cwqrs* j14jhfzb90 nx5v5 bn4k+rk*cic2irit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle *ik rqnwz49f* cr9v bx hccsn+j2 kri505bj14experiences the same magnitude magnetic force during its motion, what is the ratio of the speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magnetic3l p*ppme3cyg235l fa field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the followin y*lfl33p p2ec53 mpagg quantities must be the same for the two ions?

  02.15: A positively charged part3bo1rd;b acc;e q6g p/w h:ic2icle moves to the right. It enters a region of space in which there is an electric field directed up the plane of the paper (see figure). In which direction does a magnetic field have to point in this region so that the particle maintains;ehwaoq: pcbic3d1/ rb 2cg;6 a constant velocity?

  96.40: A proton of mass M and kiidcrm z,-.r79. a8etg 4w -q 0wrgfsmmnetic energy $E_k$ passes undeflected through a region with electric
and magnetic fields perpendicular to each other. The electric field has magnitude E. The magnitude
of the magnetic field B is:

  04.25: The speed of electrically charged beta particles is commonly uq+ny(fl1: x :br( mfedetermined byq1mrylf n(b(+: :uef x

  09.27: A proton moves straight up the plane of this page into a region th 1heu2 ph4 rsm0-ts0ahat has a magnetic field directed to the right. If the particle is undeflected as it passes throm e0-t01usrhhh a42spugh this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the pa:i(kvyu ;u9mvn,sh/sge through two regions of space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I directed into the plane of the page (as shown). There is no electric field in Region II. What is a nek,ssivu9uv /hy :nm;(cessary direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with consta z3xui qt8b7k1nt velocity through a region of space 83u kb1zxt7 qicontaining both an
electric field and a magnetic field. The electric field is directed out of the plane of the page.
Ignoring any gravitational field, which one of the following choices represents possible directions
of both the particle’s velocity and the total magnetic field in the region of space?

  15.29: An electron moves at constant non-zero velocity directly between two lon0xlq5k9.soykvs, d; x; n0e ahg straight wires. The conventional current in each wire has the same magnitude, but the currents are in opposite directions as shown in the figure. Ignoring gravity, which choice best reflects the direction of the magnetic field and the direction of the electric fiel5sxen . ky,a0h 9 lxsk;;oq0vdd that exist at the location of the electron? Any electric field in the region originates from an unseen external source.